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Your Firefox cannot be loaded. It may be missing or inaccessible.
I downloaded an add-on and had to restart it. Then it asked me to reset Firefox or to use the safe mode. I chose the safe mode but instead it disabled the add-on. So I reseted the Firefox instead. And since then everytime I open the browser, it gives me a message saying "Your Firefox cannot be loaded. It may be missing or inaccessible." I went through all the forums, but they don't seem to help. They tell me to open it and recreate the profile but I can't even get the browser to open.
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System details please? Disable or remove that Ad-don, install addons that you trust. Uninstall the current Mozilla and install the latest one. Make sure 'Mozilla' is removed fully from Appdata > Local - LocalLow - Roaming.
Modified by Wizzy
Did Firefox move the old profile to the desktop (Old Firefox Data) or is it still in the old location?
Try to create a new profile.
See "Creating a profile":
If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
You can also try to reset Firefox: